Cook tortellini in a large pot of salted water according to package directions.
While tortellini are cooking, slice sun-dried tomatoes and crush garlic. Heat a tablespoon of olive oil from the jar of sun-dried tomatoes in a pan over medium heat and add sun-dried tomatoes and garlic to it, cook for a couple of minutes while stirring without colouring garlic. Add the tomato passata or crushed tomatoes and sliced basil leaves and stir for a couple of minutes, then pour in the cream and stir to blend. Sprinkle the Parmesan cheese over top and stir until incorporated into the sauce.
Drain cooked tortellini while reserving ½ cup of water they were cooked in. Add tortellini to the pan, stir gently until coated with the sauce. Then add in approximately 3 tbsp of reserved water until desired consistency, stir gently until combined. Taste and salt if needed. Serve with additional Parmesan cheese.